Regional train service in the Rhine-Ruhr region of Germany
The Wupper-Express (RE 4) is a Regional-Express service in the German state of North Rhine-Westphalia (NRW) running between Aachen and Dortmund via Mönchengladbach, Düsseldorf, Wuppertal and Hagen. It is the third most widely used Regional-Express line in the area administered by the Verkehrsverbund Rhein-Ruhr (VRR) with approximately 24,000 passengers a day.[2] The line is part of the Rhein-Ruhr-Express (RRX) network and is operated by National Express Germany.